As a fan of the Giants for over four decades, I have had the opportunity to watch numerous Giants quarterbacks play. As a student of the team's history, I have also learned about outstanding quarterbacks from earlier decades.
Individual Quarterback Performance Metrics
When comparing quarterbacks, certain individual performance metrics go a long way towards establishing a reasonable ranking. Numbers like passing yardage, touchdown passes and completion percentage often form a reliable basis for comparison. The NFL quarterback rating (or passer rating) has been a good statistical analysis tool since it was introduced in 1973.
But these metrics don't tell the whole story.